Royal Veterinary College. 
117 
during the past year no fewer than ten cases of tuberculosis in the 
horse have come under observation in the Research Laboratory. In 
the past the lesions of this disease in the horse have generally been 
confounded with those of glanders or cancer. From the material 
collected in the Laboratory a comparative study of the lesions of 
glanders and tuberculosis is now being made. 
Actinomycosis in Cattle. 
Treatment . — In the last Annual Report attention was called to the 
ready manner in which this disease, formerly regarded as incurable, 
yields to treatment by iodide of potassium, and an account was 
given of the successful treatment of a heifer. At the date when 
that Report was written the cure appeared to have been complete ; 
but a short time afterwards it was discovered that the animal was 
again slavering, and examination of its mouth showed that the 
disease of the tongue was returning. The heifer was therefore 
again submitted to a course of iodide of potassium, begun on April 
5th and continued till the 29th of the same month. During this 
period the animal received about 1 lb. of the salt, and the improve- 
ment in the state of the tongue was just as rapid as in the first 
instance. Within six weeks’ time the disease had apparently, for a 
second time, been cured or arrested ; but as it appeared important 
to ascertain whether the cure was absolute, the heifer was kept 
under observation at the College until the month of November, when it 
was killed. During the interval the heifer had become fat, and there 
had not been any sign of a relapse. Nevertheless, the post-mortem 
examination, made on November 9th, showed that, while the tongue 
was free from actinomycosis, the glands of the throat were consider- 
ably enlarged, and contained a quantity of purulent matter in which 
microscopic examination readily revealed the actinomyces parasite. 
The cure had therefore not been complete, and had the animal been 
allowed to live, it is very probable that the disease would again have 
become active. Several other cases of relapse after the iodide 
treatment have been reported by veterinary surgeons during the 
past year, in some instances as long as twelve months after the first 
attack. It is possible that many of the cases of alleged cure 
would, if the animals were submitted to careful post-mortem 
examination, turn out like the one above referred to ; but even if 
further observation should show that such is the case, the iodide 
treatment will still remain a great success, for whereas formerly the 
disease, except by severe surgical treatment, could not even be 
temporarily arrested, the worst cases are now so far curable that 
the animals can for a time be made apparently sound, and brought 
into a condition fit for the butcher. 
In order to gain further evidenoe on this point a second case of 
the disease was obtained for experimental treatment in November 
last. The animal in this instance was a two-year-old bullock, and 
the disease had its seat in the upper jawbone. At the date of 
admission the bullock had a large swelling in this position, mastica- 
